I am a big fan of Hotkeys/shortcuts, here is a few I have collected, I will be adding more as I find them.

Several of the most popular keyboard shortcuts in Windows work in Ubuntu as well, such as Ctrl-C to copy, Ctrl-V to paste, and Ctrl-S to save a file. Here are a few others for working faster in Ubuntu and its apps:Alt-Ctrl-L Locks the screen.Alt-F1 opens the Applications menu, then use the arrow keys to navigate the submenus.Alt-F2 opens the Run Application dialog box.Alt-F3 opens the Deskbar Applet (F3 opens the search bar at the bottom of the window).Alt-F4 closes the current window.Alt-F5 unmaximizes the current window (if it's maximized, of course).Alt-F7, followed by arrow keys or mouse movement, adjusts the current window's position.Alt-F8 resizes the current window.Alt-F9 minimizes the current window.Alt-F10 maximizes the current window.Alt-spacebar opens the window menu.Alt-Tab moves between open windows.Ctrl-Alt-Tab moves between open panels on the desktop.Ctrl-W closes the current window.Ctrl-Q closes the current application.Here are some keyboard shortcuts for working in the Terminal window:Ctrl-C kills the current process.Ctrl-Z sends the current process to the background.Ctrl-D logs you out.Ctrl-R finds the last command matching the entered letters.Tab followed by entered letters lists the available commands beginning with those letters.Ctrl-U deletes the current line.Ctrl-K deletes from the cursor right.Ctrl-W deletes the word before the cursor.Ctrl-L clears the terminal output.Shift-Insert pastes the contents of the clipboard.Alt-F moves forward one word.Alt-B moves backward one word.

If you know of any other Shortcuts, please feel free to post them in the comments!